Kuki, We noticed the lack of free glasses of champagne as well on our last Princess New Year's cruise.
Back in the "old days" champagne would flow like water on Princess cruises for New Year's.
It may be that there was a slight problem with the younger folks on the ship. People would take a glass of FREE champange and leave it about half full (even bottles) and it was common for the younger cruisers to be hanging around and not "not let it go to waste".
One New Year's Eve there was a major problem in the teen center. Many of us had very "hung over" teens the next day including our daughter!
The HAPPY side of this is she never had a problem in college at frat parties, etc. with becoming overserved because she "never wanted to feel that bad again"!